Yep, you got it Melody. You can now add items to your cart and proceed to the checkout. I guarantee that was the issue with users reaching your checkout.
RE: Zopim, what do you mean by install it individually?
I hear you, paying for multiple apps can add up. Secondlayer is totally free for 14 days though. Give it a try, and if you don't get any value from it, just uninstall!